function a = init(a)

a.con = [];
a.n = 0;
a.bus = [];
a.vbus = [];
a.Id = [];
a.Iq = [];
a.If = [];
a.Edc = [];
a.Eqc = [];
a.Tm = [];
a.Efd = [];
a.delta_HP = [];
a.omega_HP = [];
a.delta_IP = [];
a.omega_IP = [];
a.delta_LP = [];
a.omega_LP = [];
a.delta = [];
a.omega = [];
a.delta_EX = [];
a.omega_EX = [];
a.u = [];
